We determined the expression of caspase 3 and bcl 2 ,cell cycle and apoptotic rate in thymus,bursa of Fabricius and spleen from 30 day old AA chickens with flow cytometry.

• 用流式细胞法测定了 30日龄AA肉鸡的胸腺、法氏囊和脾脏细胞中半胱天冬酶 3(caspase 3)、Bcl 2蛋白的表达及细胞周期和细胞凋亡率。